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(ModeL) 2 Sheets-Sheet'l.

A. DESGOPFE 86 L. DE GEORGES.

SGREW'PROPELLER.

Patented Mar. 8, 1887.

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S E R O E GR Em L0 R &P. W E FM Mm G S E D A No. 359,140. Patented Mar.8, 1887.

' @Wmmw P wloLilhogx-aphov, Washington. D; c.

UNITED STATES PATENT OFFICE,

AUGUSTE DESGOFFE AND LEONIDAS DE GEORGES, OF ODESSA, RUSSIA.

SCREW-PROPELLER.

SPECIFICATION forming part of Letters Patent No. 359,140, dated March 8,1887.

Application filed November 29, 1886. Serial No. 220,149. (Modch)Patented in Russia April 28, 1886, No.3,868; in France May 29, 1886, No.163,710; in Eng'and June 1. 1886, No. 7,351; in Germany June 5. 1886,No. 4,451, and in AustrimHungary June 5, 1886, No. 1/42.

To' (ZZZ whom, it may concern.-

Be it known that we, AUGUSTE Dnseorrn and LEONIDAS DE Gnonens, the saidDns- GOFFE being a citizen of the Republic of France and the said DEGEORGES being a sub jeet of His Majesty the Emperor of Austria, but bothbeing at present residents of the city of Odessa, in the Empire ofRussia, have jointly invented a certain new and useful Improvement inPropellers, (for which said improvement Letters Patent have beenobtained at the time of making this application in the followingcountries, but in no others, to wit: Russia, No. 3,868, dated April 28and May 10, 1886; France. No. 163,710, dated May29, 1886; England, No.7,351, dated June 1, 1886; Germany, No. 4,451, dated June 5, 1886, andAustria-Hungary, No. 1 1-2, dated June 5, 1886;) and we do herebydeclare that the following is a full, clear, and exact description ofthe invention, which will enable others skilled in the art to which itap pertains to make and use the same, reference being had to theaccompanying drawings, which form a part of this specification, and inwhich-- Figure 1 is a perspective view of a portion of the stern of avessel provided with our improved propeller. Fig. 2 is a front view ofthe propeller. Fig. 3 is a rear view of the same. Fig. 4 is a view ofthe hub. Fig. 5 is aview of one of the blades removed from the hub. Fig.6 is a side view of the propeller; and Fig. 7 is a sectional view of oneof the blades on line m 00, Fig. 5.

Similar numerals of reference indicate corresponding parts in all thefigures.

Our invention has relation to screw-propellers, principally intended forthe propulsion of vessels in navigation, although the propeller may beused for propelling aerial vessels or for other purposes where apropeller is desired; and it consists in the improved con struction andcombination of parts of such a propeller, as hereinafter more fullydescribed and claimed.

In the accompanying drawings, the numeral 1 indicates the hub, which inthe present case is shown formed with three faces, 2, although the hubmay be formed with a greater or smaller number of faces, according tothe number of blades used, and with a flat rear face, 8. The flat facesof the hub are formed with a straight rear edge, 4:, and with a parallelforward edge, 5, the said forward edge being formed by a projecting web,6, at that end of the fiat face, the edge of this web being at a rightangle to the forward and rear edges, and the inner edge of the fiat faceis formed with an oblique shoulder, 7, converging from the rear edge ofthe face to the line at which the plane of the face is tangential to thecircumference of the hub.

The blades 8 are triangular in shape and formed with a pointedprojection, 9, at the inner corner or angle, the said projection havingone edge in line with the rear edge, 10, of the blade, while its otheredge is at an obtuse angle to the forward edge, 11, of the blade, andthe blade is bentat an obtuse angle, nearly right, at a line extendingfrom the rear corner of the blade to the point of the angle formedbetween the forward edge of the blade and the edge of the projection,the said bent portion being in a plane nearly parallel with the axialline of the hub and of the propellershaft.

The rear edges of the blades are in a plane at right angles to the axialline of the hub, while the forward edges of the blades are in planesradiating from the said line, the inner portions of the bentrearportions of the blades, together with the projections, being secured tothe flat faces of the hub by means of screwbolts 12, or similar means,the forward edges of the projections of the blades being placed to bearagainst the oblique shoulders at the inner ends of the flat faces of thehub.

The larger forward portions of the blades have a slight curve convexupon the forward faces of the blades, and it will be seen that as thepropeller is revolved the forward edges of the blades will cut freelyinto the volume of water in front of them, whereupon the water will meetwith some resistance on arriving to the rear bent portions of theblades, which will thus allow the blades to acquire a hold or bearingagainst the water, increasing the effeetiveness of the propeller.

The blades will have a secure place of attachment upon the fiat faces,the edges of the projections bearing against the oblique shoulders, andthe webs forming the extensions of the faces will brace the blades,assisting in se- 5 curing them firmly.

The curve of the outer edges of the blades depends on the number of theblades employed, the curve, however, forming, preferably, a portion of acircle when the propeller is seen 1 from either end.

The propeller may be provided with any number of blades, and numerousmodifications in the construction of the propeller may be made withoutdeparting from the spirit of our 1 invention, and it may be used at thebow of a vessel as well as at the stern, or in any other desired placeand location which may be found expedient.

It will be seen that by having the rear edges of the blades in a planeat right angles to the axial line of the hub and propeller-shaft thewell or cut-out portion at the stern of the vessel for the screw may bemade comparatively small, as the rear end of the propeller may be 9 5brought directly up against the stern-post of the vessel, so that thevessel will not be weal;- ened uudulyloythe cutting out of the said wellin the stern.

Having thus described our invention, we

claim and desire to secure by Letters Patent of the United States-- 1.In a screw-propeller, the combination of a hub having flat faces, ashoulder at one end of each of said faces, and a blade secured upon eachface, the inner portion of which bears against said shoulder.

2. In a propeller, the combination of a hub having flat faces, anoblique shoulder at one end of each of said faces, and a blade securedto each of said faces, the inner end of which is triangular and bearsagainst said shoulder.

3. In ascrew-propeller, the combination of a hub having fiat faces, atriangular blade secured to each of said faces, the rear edges of whichare in a plane with each other and with the rear face of said hub andthe forward edges are pointed, and the intermediate portions of saidplates are bent or curved at an obtuse angle.

In testimony that we claim the foregoing as our own we have hereuntoaffixed our signatures in presence of two witnesses.

AUGUSTE DESGOFFE. LEONIDAS DE GEORGES. \Vitncssesr H. I". RUNGR, F.S'rnrNNs.

